BETA · A workspace for the Codex CLI

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invoice-api

Add rate limiting to /invoices

WorkspaceConnected

Limit /invoices to 60 requests/min and return 429 when exceeded. Add tests too.

10:32

Finding where to mount the middleware
Ranrg -n "app.use" src/routes

The route lives in src/routes/invoices.ts. There are two ways to count requests; pick one before I make changes.

What should the limit count by?By API key

Changed 2 filesrateLimit.ts, invoices.ts+31 -1

src/middleware/rateLimit.ts
+ const key = req.header("x-api-key");
+ if (hits(key) > 60) return c.json(err, 429);

Rannpm test -- rateLimit2 passed

Done. /invoices is limited to 60 requests/min per API key; request 61 gets a 429 with Retry-After.

Work on anything

openai/GPT-6.1-Sol High

A mock-up of an ArcCode session. Codex stops to ask you; pick an answer to see what it does next.

Built on the OpenAI Codex CLI
Self-hosted
Multi-user
bubblewrap sandbox
PostgreSQL

From scattered CLIs to one place.

Codex CLI alone

ArcCode

Where it runs

Codex CLI aloneEach personal machine

ArcCodeA server, with a separate Codex runtime per user

Switching machines

Codex CLI aloneLose context, SSH in

ArcCodeOpen a browser and keep going

On a phone

Codex CLI aloneSSH drops, tmux won't scroll, the session gets killed

ArcCodeInstall it as an app (PWA), a UI that fits a 320px screen

Stepping away

Codex CLI aloneClose the terminal and it is gone

ArcCodeSend the message, do something else, come back and it is still running

Collaboration

Codex CLI aloneOne person, one terminal

ArcCodeMulti-user, isolated workspaces

While it runs

Codex CLI aloneWait for the turn to end before typing

ArcCodeSteer mid-turn, queue the next turn

Editing code

Codex CLI aloneSwitch to another editor

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Git tokens

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Two ways to work. One platform.

Chat

Work with Codex, you make the calls.

Each session runs server-side and streams to the browser in real time. Steer Codex mid-turn, queue the next turn, and answer when it needs you to pick a direction.

Steer mid-turn, stop, or queue a message for the next turn.
Codex asks back with multiple-choice questions you answer right in the session.
Sub-agents appear nested in the root session transcript.
Side panel: Plan, Context (usage, compact), Sub-agents.

See details

invoice-api

Add rate limiting to /invoices

Limit /invoices to 60 requests/min per API key and return 429 when exceeded. Add tests.

10:32

Plan2/3

Edited 2 files · Ran command · Delegated task · +1 more

Finding where to mount the middleware
DelegatedspawnAgent · Write tests for rateLimit: request 61 returns 429 with Retry-Aftercompleted
Changed 2 filesrateLimit.ts, invoices.ts

Rannpm test -- rateLimit

$ npm test -- rateLimit
 ✓ test/rateLimit.test.ts (2 tests)

Message Codex while it works…

GPT-6.1-SolHigh

IDE

Edit code right in the browser.

A file tree, the Monaco editor, a real terminal and a Git panel for each project, all without leaving the tab. Works on its own, no agent required.

Monaco: saves guarded against overwrites, previews for Markdown, HTML, SVG, PDF and images.
Upload, move and batch actions on a file tree with git status.
Git panel: commit, pull, push, fetch, switch branch.
A real shell terminal per project that keeps its scrollback when you reopen it.

See details

invoice-api

Files

OverviewFilesTerminalGitSkills

src/middleware/rateLimit.ts

import type { NextFunction, Request, Response } from 'express';

const WINDOW_MS = 60_000;
const LIMIT = 60;

const hits = new Map<string, { count: number; resetAt: number }>();

export function rateLimit(req: Request, res: Response, next: NextFunction) {
  const key = req.header('x-api-key') ?? req.ip ?? 'anonymous';
  const now = Date.now();
  const entry = hits.get(key);

  if (!entry || entry.resetAt <= now) {
    hits.set(key, { count: 1, resetAt: now + WINDOW_MS });
    return next();
  }

  if (entry.count >= LIMIT) {
    const seconds = Math.ceil((entry.resetAt - now) / 1000);
    res.setHeader('Retry-After', String(seconds));
    return res.status(429).json({ error: 'rate_limited' });
  }

  entry.count += 1;
  next();
}

Dogfooding

ArcCode is built with ArcCode.

Every feature above is something our team uses daily to build this very product: handing bugs to Codex, reviewing diffs and committing in the browser, running tests in the project terminal. Nothing ships here until we trust it ourselves.

Get started in three steps.

1
Connect Codex: a ChatGPT account (device code) or your own provider.
2
Open a project: create one or clone from Git into your isolated workspace.
3
Hand work to Codex, edit code, run the terminal and git.

Your models, extended your way.

Model

Link a ChatGPT account with a device code, or add your own provider with a base URL and API key. Pick the model and effort for each turn.

MCP

Add MCP servers per user, stdio or HTTP; a built-in Git MCP handles fetch, pull and push.

Skills and Plugins

Turn Skills on or off per user or per repo (.codex/skills), install Plugins from a Git marketplace repo.

Your data and control stay with you.

Closed sign-up: accounts are created only from an admin invite link
A separate Codex runtime per user inside a bubblewrap sandbox
Git tokens encrypted with AES-256-GCM, never visible to Codex

See security details

FAQ

What is ArcCode?

A browser workspace for the OpenAI Codex CLI, in two parts: Chat to hand work to Codex, and IDE to edit files, run a terminal and use git.

What does BETA mean?

The product is still maturing and access is limited by invite. Talk to us if you want to use it early and help shape it.

How do Chat and IDE differ?

Chat is for working with Codex directly in each session; IDE is for browsing and editing files, running a terminal and git on that same project.

What account do I need for Codex?

Link your ChatGPT account with a device code, or add your own provider with a base URL and API key.

Can a company self-host it?

Yes, ArcCode can be self-hosted. Talk to us about deployment.

Get started with ArcCode.

We're in BETA with invite-based access. Talk to us about what you need.

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